tmp/tmplo5za32d/{from.md → to.md}
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#### Index of maximum absolute value of vector elements <a id="linalg.algs.blas1.iamax">[[linalg.algs.blas1.iamax]]</a>
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``` cpp
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template<in-vector InVec>
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typename InVec::extents_type vector_idx_abs_max(InVec v);
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template<class ExecutionPolicy, in-vector InVec>
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typename InVec::extents_type vector_idx_abs_max(ExecutionPolicy&& exec, InVec v);
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```
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[*Note 1*: These functions correspond to the BLAS function
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`IxAMAX`. — *end note*]
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Let `T` be
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``` cpp
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decltype(abs-if-needed(real-if-needed(declval<typename InVec::value_type>())) +
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abs-if-needed(imag-if-needed(declval<typename InVec::value_type>())))
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```
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*Mandates:* `declval<T>() < declval<T>()` is a valid expression.
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*Returns:*
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- `numeric_limits<typename InVec::size_type>::max()` if `v` has zero
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elements;
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- otherwise, the index of the first element of `v` having largest
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absolute value, if `InVec::value_type` is an arithmetic type;
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- otherwise, the index of the first element `vₑ` of `v` for which
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``` cpp
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abs-if-needed(real-if-needed($v_e$)) + abs-if-needed(imag-if-needed($v_e$))
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```
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has the largest value.
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